[Settings] Code refactor - remove unused import lines

Remove some unused import lines within source code based on
https://source.android.com/setup/contribute/code-style

Bug: 182867979
Test: build pass
Change-Id: I76dbcfa9e5b435b2838401dfee15b12f472d07d0

src/com/android/settings/network/telephony/ContactDiscoveryDialogFragment.java

@@ -22,11 +22,9 @@ import android.content.Context;
 import android.content.DialogInterface;
 import android.os.Bundle;
 import android.telephony.ims.ImsManager;
-import android.telephony.ims.ImsRcsManager;
 import android.text.TextUtils;
 
 import androidx.annotation.VisibleForTesting;
-import androidx.fragment.app.FragmentManager;
 
 import com.android.settings.R;
 import com.android.settings.core.instrumentation.InstrumentedDialogFragment;

src/com/android/settings/network/telephony/ContactDiscoveryPreferenceController.java

@@ -37,7 +37,6 @@ import androidx.preference.SwitchPreference;
 
 import com.android.settings.network.SubscriptionUtil;
 
-
 /**
  * Controller for the "Contact Discovery" option present in MobileNetworkSettings.
  */

src/com/android/settings/network/telephony/MobileDataDialogFragment.java

@@ -29,7 +29,6 @@ import androidx.appcompat.app.AlertDialog;
 import com.android.settings.R;
 import com.android.settings.core.instrumentation.InstrumentedDialogFragment;
 
-
 /**
  * Dialog Fragment to show dialog for "mobile data"
  *

src/com/android/settings/network/telephony/NrDisabledInDsdsFooterPreferenceController.java

@@ -28,7 +28,6 @@ import com.android.settings.core.BasePreferenceController;
 import com.android.settings.utils.AnnotationSpan;
 import com.android.settingslib.HelpUtils;
 
-
 /**
  * Class to show the footer that can't connect to 5G when device is in DSDS mode.
  */

src/com/android/settings/network/telephony/TelephonyAvailabilityHandler.java

@@ -20,8 +20,6 @@
  */
 package com.android.settings.network.telephony;
 
-import android.content.Context;
-
 public interface TelephonyAvailabilityHandler {
 
     /**

src/com/android/settings/network/telephony/gsm/OpenNetworkSelectPagePreferenceController.java

@@ -41,7 +41,6 @@ import com.android.settings.network.telephony.MobileNetworkUtils;
 import com.android.settings.network.telephony.NetworkSelectSettings;
 import com.android.settings.network.telephony.TelephonyBasePreferenceController;
 
-
 /**
  * Preference controller for "Open network select"
  */